H3C Technologies H3C S7500E Series Switches - Manual (Page 20)

1-6
Configuring Flow Control on an Ethernet Port
When flow control is enabled on both sides, if traffic congestion occurs at the ingress port, it will send a
Pause frame notifying the egress port to temporarily suspend the sending of packets. The egress port
is expected to stop sending any new packet when it receives the Pause frame. In this way, flow control
helps to avoid dropping of packets. Note that this will be possible only after flow control is enabled on
both the ingress and egress ports.
Follow these steps to enable flow control on a port:
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet port or OLT port
view
interface interface-type
interface-number
—
Enable flow control flow-control
Required
By default, receive flow control is
disabled on a port.
Configuring Link Change Suppression on a Port
An Ethernet port or an ONU port has two physical link states: up and down. Each time the physical link
of a port goes up or comes down, the physical layer reports the change to the upper layers, and the
upper layers handle the change, resulting in increased overhead.
This link change suppression functionality reduces the extra overhead occurred due to frequent link
changes within a short period of time.
Configuring Link Change Suppression on an Ethernet Port
Configuring Link Down Suppression
You can configure link down suppression to delay the reporting of link down events on an Ethernet port.
When the link down suppression interval expires, the physical layer reports the link down event if the
port still has not recovered.
Follow these steps to configure link down suppression on an Ethernet port:
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet port view
interface interface-type
interface-number
—
Set a link down suppression
interval
link-delay delay-time
Required
Link down suppression is disabled
by default.